Double Materiality Explained for Non-Specialists

If you work anywhere near sustainability, reporting or strategy, you have probably heard the term "double materiality". It appears in sustainability reporting rules, consultancy reports and board papers, often without much explanation. It can sound like jargon designed to keep non-specialists out.

The underlying idea is straightforward, and useful for any organisation trying to decide which sustainability issues deserve its attention. This article explains it in plain English.

First, what does "material" mean?

In reporting, something is material if it matters enough that leaving it out would mislead the people relying on the information. In financial reporting, materiality has long been about whether information could influence the decisions of investors and lenders.

Sustainability reporting raised a question: material to whom, and in which direction?

The two directions

Double materiality looks at sustainability issues from two directions.

Financial materiality: outside-in

How do sustainability issues affect the organisation's financial position, performance, cash flows and prospects?

Examples:

• Climate change increases flood risk at a key site, affecting insurance costs and operations.
• New carbon pricing raises the cost of energy-intensive processes.
• Skills shortages make it harder and more expensive to recruit.
• Changing customer preferences reduce demand for a product.

This is the perspective investors typically care most about. Standards developed for investor-focused reporting, such as those from the International Sustainability Standards Board (ISSB), are built mainly on this view.

Impact materiality: inside-out

How does the organisation affect people and the environment, positively or negatively, regardless of whether it affects its finances?

Examples:

• The organisation's greenhouse gas emissions contribute to climate change.
• Working conditions in its supply chain affect workers' health and rights.
• Its products affect customers' wellbeing or safety.
• Its operations affect local water supplies or biodiversity.

This perspective matters to a wider group: employees, communities, customers, regulators and civil society.

Double materiality

An issue is material under double materiality if it is material from either perspective, or both. Many issues are material both ways: a company's emissions affect the climate (impact) and expose it to carbon costs and regulation (financial).

The approach was popularised in Europe and is central to the EU's sustainability reporting rules for companies in scope, although the scope and timing of those rules have been revised. Even organisations outside formal requirements find the thinking useful.

How a double materiality assessment works

A materiality assessment is the process of deciding which sustainability issues are material. In outline:

1. Understand your context

Map your activities, value chain (suppliers, operations, customers) and stakeholders. Where do you operate? What do you buy, make and sell? Who is affected?

2. List potential issues

Draw up a long list of sustainability topics that could be relevant: climate, pollution, water, biodiversity, resource use, own workforce, workers in the value chain, communities, customers, business conduct and so on. Industry guidance and peer reports help.

3. Assess impacts

For each issue, consider the actual and potential impacts the organisation has on people and the environment. Consider how severe they are (scale, scope and how hard to reverse) and, for potential impacts, how likely.

4. Assess financial effects

For each issue, consider the risks and opportunities it creates for the organisation, how likely they are and how large the financial effect could be.

5. Engage stakeholders

Talk to the people affected and the people who use your information: employees, customers, suppliers, investors, communities and experts. Their views test your assumptions and often reveal issues you missed.

6. Decide thresholds and conclude

Agree criteria for what counts as material, apply them consistently, and document your reasoning. The result is a list of material topics that shapes your strategy, targets and reporting.

7. Review regularly

Material issues change as the organisation, its value chain and the world change. Revisit the assessment periodically, and when significant changes occur.

Common pitfalls

• Treating it as a reporting exercise only. The real value is in deciding where to focus effort, not just what to disclose.
• Relying on internal views alone. Without genuine stakeholder input, assessments tend to confirm existing priorities.
• Ignoring the value chain. Many of the most significant impacts and risks sit with suppliers or customers, not in the organisation's own operations.
• Making everything material. A list of thirty material topics suggests the organisation has not really made choices.
• Poor documentation. If you cannot explain why a topic was or was not judged material, the assessment will not stand up to scrutiny.

Why it matters beyond compliance

Even if you are not subject to formal reporting rules, a double materiality view helps you:

• Focus sustainability effort where it matters most, rather than on what is fashionable.
• Understand risks that conventional risk processes may miss.
• Explain your priorities credibly to customers, employees and investors.
• Prepare for future requirements, from regulators or from large customers asking about your supply chain.

How mature is your ESG approach?

The ESG / Sustainability assessment covers strategy and commitment, environmental impact and climate action, social responsibility, governance and transparency, measurement and reporting, and supply chain and stakeholder engagement. It helps you see whether sustainability is at the awareness stage, a committed programme, or genuinely integrated into how the organisation decides.

Frequently asked questions

Is double materiality required by law?

It is required for organisations within the scope of certain sustainability reporting rules, notably in the European Union. Many other organisations use it voluntarily because it gives a fuller picture.

What is the difference between double materiality and single materiality?

Single materiality, as used in investor-focused standards, looks mainly at how sustainability issues affect the organisation financially. Double materiality adds the organisation's impacts on people and the environment.

How often should we carry out a materiality assessment?

Many organisations do a full assessment every two to three years, with a lighter annual review to check whether anything significant has changed.